FiveFingers shoes are the closest to barefoot you can get.
We all think that this great amount of support our modern gym shoes are providing us today are benefitting us, while in fact it's doing just the opposite. This much support weakens our feet and leg muscles, allowing us to be more prone to injury. The closer we are to walking/running barefoot, the stronger our feet, and the less injury and pain we experience.
This specific style of shoe also naturally forces you to avoid exerting shock on your heel when you run. Don't believe me? Take off your shoes and try running around for a few minutes. You'll notice right away that your form changes while barefoot, and that is the same idea these shoes are mimicking. With these, your form is corrected quickly, and you slowly start getting used to running correctly.
There's an interesting article on a comparative study comparing those who have lived most of their life barefoot vs. shoe-wearers. Author Phil Hoffman explains that in the "one hundred and eighty-six pairs of primitive feet examined, I did not find a single foot associated with the symptoms of weakness so common in adult shoe-wearing feet, which are weakened by the restraint the shoe exerts over function."
Read his article here:
"Conclusions Drawn from a Comparative Study of the Feet of Barefooted & Shoe-Wearing Peoples"
You must ease into these shoes when first purchased. Walk around in them for 10 minutes the first day and see how your feet feel. When first running in them, I warn you, your feet and calves WILL be sore! Don't run more than 10 minutes your first time, or your legs will literally kill the next day, and you will not be able to walk. If you're wearing them to the gym, bring an extra pair of normal gym shoes to change into while you're getting used to these in the beginning.